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Chapter 4: Troubleshooting

Acquisition/Backplane Assembly Trouble Isolation - Scope Self Tests

Acquisition/Backplane Assembly Trouble Isolation - Scope Self

Tests

If the Acquisition assemblies or Backplane assembly have been removed by a prior procedure,

reinstall them.

Power up the oscilloscope and then go under Utilities > Self Test. Select the Scope Self Test

option from the Self Test pull-down menu and then press the Start Test button. If one of these

tests fails, look at the error message to see if it displays a channel specific error message (this

will be the case in most instances). If it is channel specific and it is not the Timebase Test Group

that failed then replace the acquisition board that corresponds to that channel (channels 1 and

2 - lower acquisition board, channels 3 and 4 - upper acquisition board). If it is the Timebase

Test Group that failed then replace the backplane assembly.

If the error message does not mention a channel, then refer to the discussions below for the

test that failed to see the diagnostic steps. Sometimes there is no action and the technician

simply needs to contact the software/hardware teams in order to debug the problem.

Each test also has a section called “Board Level Repair” where the troubleshooting is more

detailed than the typical assembly level repair.

Scope Self Tests

Vertical Test Group

• Front End DAC Linearity Test - This test verifies the linearity of each channel’s front end DAC.

If the test finds a problem, it will report a failure for the DAC on the associated channel.

• Board Level Repair - Re-solder or replace the DAC that is failing. If this does not fix the problem,

further hardware level debugging is necessary.

• Front End DAC MaxMin Test - This test measures the minimum and maximum output voltage

values of each channel’s front end DAC. If the test measures any values that are out of the

range of expected values, it will report a failure for the DAC on the associated channel.

• Board Level Repair - Re-solder or replace the DAC that is failing. If this does not fix the problem,

further hardware debugging is necessary.

• Otter Register - This test verifies that all of the Otter preamp registers can be correctly written

to and read from. If this test reads any registers whose values are not equal to what they were

written to, it will report a failure for the preamp on the associated channel.

• Board Level Repair - Re-solder or replace the Otter preamp that is failing. If this does not fix the

problem, further hardware level debugging is necessary.

• Overload - This test simulates an overload condition on each channel and verifies that when

such a condition exists it immediately generates an interrupt to the host processor. If such a

condition is not detected properly, the test will report a failure for the associated channel.

• There are numerous possible causes for this error. Report the error to the Infiniium software team.

Trigger Test Group

• Trigger Lvl DAC Test - This test has not been implemented yet and currently does nothing.

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Agilent Technologies Ininiium 90000 Dokumentacja Strona 80